scholarly journals Association analysis for agronomic traits in wheat under terminal heat stress

2021 ◽  
Author(s):  
Adeel Khan ◽  
Munir Ahmad ◽  
Mukhtar Ahmed ◽  
Kulvinder Singh Gill ◽  
Zahid Akram
Keyword(s):  
Heat Stress ◽  
Association Analysis ◽  
Agronomic Traits ◽  
Terminal Heat Stress

Evaluation of Triticum durum–Aegilops tauschii derived primary synthetics as potential sources of heat stress tolerance for wheat improvement

2021 ◽  
Vol 19 (1) ◽  
pp. 74-89
Author(s):  
Amandeep Kaur ◽  
Parveen Chhuneja ◽  
Puja Srivastava ◽  
Kuldeep Singh ◽  
Satinder Kaur
Keyword(s):  
Heat Stress ◽  
Stress Tolerance ◽  
Hexaploid Wheat ◽  
Aegilops Tauschii ◽  
Grain Filling ◽  
World Population ◽  
Potential Candidate ◽  
Terminal Heat Stress ◽  
Heat Stress Tolerance ◽  
The Impact

AbstractAddressing the impact of heat stress during flowering and grain filling is critical to sustaining wheat productivity to meet a steadily increasing demand from a rapidly growing world population. Crop wild progenitor species of wheat possess a wealth of genetic diversity for several biotic and abiotic stresses, and morphological traits and can serve as valuable donors. The transfer of useful variation from the diploid progenitor, Aegilops tauschii, to hexaploid wheat can be done through the generation of synthetic hexaploid wheat (SHW). The present study targeted the identification of potential primary SHWs to introduce new genetic variability for heat stress tolerance. Selected SHWs were screened for different yield-associated traits along with three advanced breeding lines and durum parents as checks for assessing terminal heat stress tolerance under timely and late sown conditions for two consecutive seasons. Heat tolerance index based on the number of productive tillers and thousand grain weight indicated that three synthetics, syn9809 (64.32, 78.80), syn14128 (50.30, 78.28) and syn14135 (58.16, 76.03), were able to endure terminal heat stress better than other SHWs as well as checks. One of these synthetics, syn14128, recorded a minimum reduction in thousand kernel weight (21%), chlorophyll content (2.56%), grain width (1.07%) despite minimum grain-filling duration (36.15 d) and has been selected as a potential candidate for introducing the terminal heat stress tolerance in wheat breeding programmes. Breeding efforts using these candidate donors will help develop lines with a higher potential to express the desired heat stress-tolerant phenotype under field conditions.

Analysis of genotypic variation for normalized difference vegetation index and its relationship with grain yield in winter wheat under terminal heat stress

2012 ◽  
Vol 131 (6) ◽  
pp. 716-721 ◽  
Author(s):  
Shahnoza Hazratkulova ◽  
Ram C. Sharma ◽  
Safar Alikulov ◽  
Sarvar Islomov ◽  
Tulkin Yuldashev ◽  
...  
Keyword(s):  
Heat Stress ◽  
Winter Wheat ◽  
Grain Yield ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Genotypic Variation ◽  
Terminal Heat Stress

scholarly journals Phenotypic and genome-wide association analysis of spike ethylene in diverse wheat genotypes under heat stress

2016 ◽  
Vol 214 (1) ◽  
pp. 271-283 ◽  
Author(s):  
Ravi Valluru ◽  
Matthew P. Reynolds ◽  
William J. Davies ◽  
Sivakumar Sukumaran
Keyword(s):  
Heat Stress ◽  
Association Analysis ◽  
Genome Wide Association ◽  
Wheat Genotypes ◽  
Genome Wide Association Analysis ◽  
Genome Wide

Screening of Wheat (Triticum aestivium L.) Genotypes for Some Important Traits Against Natural Terminal Heat Stress

2006 ◽  
Vol 9 (11) ◽  
pp. 2069-2075 ◽  
Author(s):  
Ubaidullah . ◽  
Raziuddin . ◽  
Tila Mohammad . ◽  
Hafeezullah . ◽  
Sardar Ali . ◽  
...  
Keyword(s):  
Heat Stress ◽  
Terminal Heat Stress

scholarly journals Humic acid enhances heat stress tolerance via transcriptional activation of Heat-Shock Proteins in Arabidopsis

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Joon-Yung Cha ◽  
Sang-Ho Kang ◽  
Imdad Ali ◽  
Sang Cheol Lee ◽  
Myung Geun Ji ◽  
...  
Keyword(s):  
Heat Stress ◽  
Humic Acid ◽  
Heat Shock ◽  
Stress Tolerance ◽  
Transcriptional Activation ◽  
Molecular Mechanisms ◽  
Agronomic Traits ◽  
Enrichment Analysis ◽  
Gene Families ◽  
Heat Stress Tolerance

Abstract Humic acid (HA) is composed of a complex supramolecular association and is produced by humification of organic matters in soil environments. HA not only improves soil fertility, but also stimulates plant growth. Although numerous bioactivities of HA have been reported, the molecular evidences have not yet been elucidated. Here, we performed transcriptomic analysis to identify the HA-prompted molecular mechanisms in Arabidopsis. Gene ontology enrichment analysis revealed that HA up-regulates diverse genes involved in the response to stress, especially to heat. Heat stress causes dramatic induction in unique gene families such as Heat-Shock Protein (HSP) coding genes including HSP101, HSP81.1, HSP26.5, HSP23.6, and HSP17.6A. HSPs mainly function as molecular chaperones to protect against thermal denaturation of substrates and facilitate refolding of denatured substrates. Interestingly, wild-type plants grown in HA were heat-tolerant compared to those grown in the absence of HA, whereas Arabidopsis HSP101 null mutant (hot1) was insensitive to HA. We also validated that HA accelerates the transcriptional expression of HSPs. Overall, these results suggest that HSP101 is a molecular target of HA promoting heat-stress tolerance in Arabidopsis. Our transcriptome information contributes to understanding the acquired genetic and agronomic traits by HA conferring tolerance to environmental stresses in plants.

scholarly journals Sequence Variants Linked to Key Traits in Interspecific Crosses between African and Asian Rice

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1653
Author(s):  
Hayba Badro ◽  
Marie-Noelle Ndjiondjop ◽  
Agnelo Furtado ◽  
Robert Henry
Keyword(s):  
Association Analysis ◽  
Agronomic Traits ◽  
Heading Date ◽  
Sucrose Metabolism ◽  
Interspecific Crosses ◽  
Oryza Glaberrima ◽  
Gene Pools ◽  
Synonymous Snps ◽  
African Rice ◽  
Asian Rice

Asian and African rice gene pools vary in many traits that are important in rice breeding. The genetic basis of these differences was evaluated by analysis of important agronomic traits in crosses between African and Asian rice. Trait-associated variants (TAVs) influencing three quantitative agronomic traits, heading date (Hd), tiller number at maturity (T), and 1000 grain weight (TGW), were identified by association analysis of crosses between Asian and African rice. Populations were developed by crossing WAB56-104 (Oryza sativa) and CG14 (Oryza glaberrima). DNA from plants with extremely high or low values for these phenotypes was bulked and sequenced. The reference genome of O. sativa cv Nipponbare was used in general association analysis and candidate gene analysis. A total of 5152 non-synonymous single nucleotide polymorphisms (SNPs) across 3564 genes distinguished the low and the high bulks for Hd, T, and TGW traits; 611 non-synonymous SNPs across 447 genes were found in KEGG pathways. Six non-synonymous SNPs were found in the sequences of LOC107275952, LOC4334529, LOC4326177, LOC107275432, LOC4335790, and LOC107275425 genes associated with Hd, T, and TGW traits. These genes were involved in: abscisic-acid biosynthesis, carotenoid biosynthesis, starch and sucrose metabolism, and cytokinin biosynthesis. Analysis of 24 candidate genes associated with Hd, T, and TGW traits showed seven non-synonymous variations in the sequence of Hd3a and Ehd2 from the Hd genes (not in a KEGG pathway), D10 and D53 from the T genes (strigolactones biosynthetic pathway), and Gn1a and GIF1 from the TGW genes (cytokinin biosynthetic and starch and sucrose metabolism pathways). This study identified significant differences in allele frequencies supported by high sequence depth in analysis of bulks displaying high and low values for these key traits. These trait-associated variants are likely to be useful in rice improvement.

Comparison of teosinte (Zea mexicana L.) and inter-subspecific hybrids (Zea mays L.×Zea mexicana) for high forage yield under two sowing regimes

2015 ◽  
Vol 66 (1) ◽  
pp. 49 ◽  
Author(s):  
Imtiaz Akram Khan Niazi ◽  
Saeed Rauf ◽  
Jaime A. Teixeira da Silva ◽  
Hassan Munir
Keyword(s):  
Zea Mays ◽  
Heat Stress ◽  
Zea Mays L ◽  
Agronomic Traits ◽  
Plant Biomass ◽  
Stress Conditions ◽  
Forage Yield ◽  
Total Biomass ◽  
Percentage Survival ◽  
Biomass Plant

This study was undertaken to evaluate the response of teosinte (Zea mexicana L.) and intersubspecific hybrids to heat stress, in particular productivity. Unlike maize (Zea mays L.), teosinte demonstrated thermophilic properties, namely lower heat injury, sustained chlorophyll content under heat stress (36−45°C) and high percentage survival of seedlings (at 55°C). Teosinte also had the ability to produce large plant biomass (27% and 55% higher yield than maize under non-stressed and stress conditions, respectively) and therefore could be exploited as a forage crop. However, teosinte forage had low animal intake (1.48 kg day–1) because of high pubescence density (10.38 view–1) and low sweetness (9.90°Brix). There was a high percentage of heterosis in variable intersubspecific crosses and traits, and a high magnitude of over-dominance for many traits, for example 5.93–7.06 for total biomass plant–1. Hybrids showed additional advantages, including high oil (20% and 4%) and protein (14% and 25%) contents compared with teosinte under non-stressed and stress conditions, respectively. Moreover, inter-subspecific hybrids were also resistant to heat stress, with the capacity for sustaining growth for a longer period (20% and 33% higher than maize under non-stressed and stress conditions, respectively). Genetic distance between parents—calculated from stable agronomic traits—could be used to select parents for high heterosis under both heat stress and non-stressed conditions.

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